Reheater for compound engines



(No Model.) 3 Sheets-Sheet 1.

E. D. LEAVITT, Jr. Reheater for Compound Engines.

No.- 231,061. Patented Aug. 10,188Q.

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Inventor:

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Attorney.

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3 Sheets-Sheet 2.

(No Model.)

B. D. LEAYITT, Jr.

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(No Model.'). 3Sheets-Sheet 3.

- E. D. LEAVITT, Jr.

Reheater for CompoundEngines.

Patented Aug. 10,1880.

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Inventor: maw gym by L Witnesses I 6 9V. WW

NJEI'ERS. FNOTO LITHOGRAPHER, WASHINGTON. 5,2;

UNITE TATES ERASMUS D. LEAVITT, JR, OF OAMBRIDGEPORT, MASSACHUSETTS.

REHEAT-ER FOR COMPOUND ENGINES.

SPECIFICATION forming part of Letters Patent No. 231,061, dated August10, 1880.

Application filed March 25, 1880.

To all whom it may concern:

Be it known that I, ERASMUS D. LEAVITT, JR., of Gambridgeport, in thecounty of Middlesex and State of Massachusetts, have invented certainnew and useful Improvements in Reheaters for Compound Engines, (Case13,) of which the following, taken in connection with the accompanyingdrawings, is a specification.

My invention relates to the construction of heaters for reheating theexhaust-steam from the high-pressure cylinder of a compound steam-enginebefore it enters the low-pressure cylinder, and is designed for use incases where the cylinders are necessarily too near together to permitthe use of the heater shown and described in another application of evendate herewith; and it consists in the use, in combination with the highand low pressure cylinders of a compound steam-engine, of a heatercomposed of acentral ch amber communicating at opposite sides with theexhaust of the highpressure cylinder and the inlet-valve chamber of thelow-pressure cylinder, respectively, and provided internally with one ormore deflecting-partitions, by which the exhaust-steam entering saidchamber is compelled to traverse two or more times the length of saidchamber among a series of small tubes which extend across said chamberand open through its side walls into one or 'more side chambers whichcover or inclose the ends of said tubes, and through which and saidtubes live steam from the boiler is made to flow and impart a large partof its heat through the walls of said tubes to the exhaust-steamsurrounding and moving among said tubes.

It furtherconsists in a novel method of connecting said heater to thecylinders, whereby provision is made for unequal expansion andcontraction, which will be best understood by reference to thedescription of the drawings, in which Figure 1 is a plan of my improvedheater and parts of the high and low'pressure cylinders of a compoundengine in their proper position and relation to each other. Fig. 2 is aside elevation of the same as applied to the upper ends of thecylinders. Fig. 3 is a vertical section of the heater and theexhaust-valve seat of the high-pressure cylinder, the cuttingplane beingon line or w on Fig. 1. Fig. 4 is a (No model.)

section on line y 3/ on Fig. 3. Fig. 5 is a section on line z z on Fig.3 with the valve-seat removed 5 and Fig. 6 is an elevation of theheater, lookingfrom the high-pressure toward the low-pressure cylinder,with a portion of the expansion-plate broken away and the tubes removed.

A represents a portion of the upper end of the high-pressure cylinder ofa compound eugine, and B represents a similar portion of thelow-pressure cylinder in their proper relative positions and connectedtogether by my improved heater, composed of the main casting O andcovers or heads 0 and firmly bolted together with packed steam-tightjoints.

The casting O incloses a chamber the vertical sides of which arestraight and substantially parallel with each other, while its top andbottom sides are preferably curved, as shown, and its two oppositevertical walls, which are nearest to each other, are provided withopenings D and D, respectively, around which are flanges a and a, thepurpose of which will presently appear.

. The flange a, surrounding the opening D, is bolted firmly to thecylinder B or its inlet-valve casing, as shown in Figs. 1 and 2.

The opening D, which is considerably larger th an D, has bolted over itthe plate E, of boileriron, through the center of which is cut arectangular opening, b, of a much smaller area than the opening D in thecasting O, the plate E being bolted around the opening I) to thevalve-seat F of the high-pressure cylinder A,

which valve-seat is firmly secured to said cyl-.

inder.

This construction enables the heater or cylinders to expand and contractwithout injury to the steam-joints, the plate E springing between itsbearing upon the heater and its hearing upon the valve-seat.

The interior of the chamber 0 is provided with the deflecting-partitionsG and H, extending across said chamber from front to rear, and soarranged that the exhaust-steam escaping from the cylinder A throughopenings 1) and D is turned downward to the lower end of said chamber bythe deflector G till it comes in contact with the deflector H, by whichitis turned upward around the lower end of G to the upper end of thechamber, where it passes around the upper edge of H, and descending uponits other side, passes through the opening D into the cylinder B.

A series of small thin tubes, 0 c c, extend across the chamber 0, in ahorizontal position, and extend through the opposite walls of saidchamber, as shown in Figs. 3, 4, and 5. These tubes are arranged inthree separate clusters, and are set in zigzag positions or diagonalrows, and .the covers or heads 0 and G are each provided withaninwardly-projecting rib, [Z (I, so that when said heads are secured inposition the ends of said tubes are inclosed in chambers c and 0 uponone side and e and 6 upon the other side, the chambers upon either sideof the chamber 0 being of unequal length and arranged, relative to thechambers upon the other side, in such a manner that live steam from theboiler entering the chamber 0 through the pipe I will pass through onecluster of said tubes into the chamber 0 through the central cluster ofsaid tubes into the chamber e, and thence through the lower cluster oftubes into the chamber a and escape through the pipe I, substantially asdescribed in another application of even date herewith, the object'ofthis invention being to raise the temperature of the steam exhaustedfrom the cylinder A, and thereby increase its pressure before it entersthe cylinderB by imparting to it a portion of the heat of the live steampassing through the tubes 0 0. It is desirable that said exhaust-steamshould be exposed to as 1c rge an area of heated tube-surface and for aslong a time as practicable. Hence the reason for using thedeflector-plates G and H, whereby the passage-from cylinder to cylinderis made several times longer than if it were direct.

What I claim as new, and desire to secure by Letters Patent of theUnited States, is

1. The reheater 0, provided with the side chambers, c, e, 0 and 6 madeof two different lengths, the series of horizontal tubes 0 c 0, pipes Iand I, and the deflector-partitions G and H, all arranged and adapted tooperate substantially as described.

2. In combination with the cylinders of a compound engine, areheater-chambcr located between said cylinders and communicating therewitl1,traversed by a series of tubes through which live steam from aboiler may circulate, and provided with one ormore deflec'tonpartitions,all constructed and arranged for operation substantially as and for thepurposes described.

3. In combination with the high and low pressure cylinders of a compoundengine, the reheater-chamber O, bolted rigidly to one of said cylindersand connected to the other by means of the thin flexible plate E, andprovided with means of communication with each of said cylinders,substantially as described.

4. The combination of the cylinders A and B, reheater-chamber 0,provided with the defiectors G and H, and having set therein the tubes 0c, chambered heads or covers 0 and O pipes I and I, and theexpansion-plate E, all arranged and adapted to operate substantially asdescribed.

Executed at Boston, Massachusetts, this 23d day of March, A. D., 1880.

ERASMUS D. LEAVITT, JR.

Witnesses:

E. A. HEMMENWAY, WALTER E. LOMBARD.

